Postal workers in the Northern Territory are set to go on strike tomorrow.

They had delayed industrial action for 24 hours to make sure year 12 students receive their school results.

The branch secretary of the NT and South Australian Communications Union, Graham Lorraine, says the strike action has enormous support in both regions.

"The reaction from the NT members was fantastic," he said.

"They're very well across what's going on and even this morning I'm receiving many calls from NT members just to clarify what's happening right through from Alice Springs to Katherine right through to the Darwin area."